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Many heroes asserted themselves in Oklahoma yesterday, from the first responders digging through the rubble for survivors, to the teachers who shielded children from the massive tornado that touched down as the school day was ending.

While perhaps not as heralded, certainly the experts at the National Weather Service deserve some credit for saving lives as well. One of the best ways to prevent high body counts when tornadoes barrel through populated areas is to warn residents ahead of time—which is the job of the NWS. They did it well yesterday, issuing early warnings allowed countless people to seek shelter before mayhem arrived.

But the NWS has, in recent years, suffered under serious budget restraints placed on it by deficit hawks in Congress and the White House. Far from the public view, the NWS is starting to come apart at the seams—and the full effects of the sequester haven’t even been felt yet. So what if, next time, the NWS isn’t able to do its job as well?

The tornado in Oklahoma yesterday provides a good case study for both the crucial import of the NWS’s work and the very small margin for error. Tornadoes present a particular challenge because, while the conditions that create them are easily identifiable—warm, moist air from the gulf colliding with warm, dry continental air and cold, dry air from the Rockies—the tornadoes themselves are incredibly unpredictable. Scientists still are not sure why some thunderstorms produce them and others do not.

The tornado simply appears, almost out of nowhere. In Oklahoma, it was well over a mile wide, with furious 200 mile per hour winds shredding most everything in its path, which, it quickly became apparent, would include a densely populated suburb. This is what it looked like:

This is a terrifying experience for most involved, but not an uncommon one in America—in fact, 75 percent of all tornadoes occur here. This map from the Smithsonian shows fifty-six years of tornado strikes and the path they took:

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When a tornado appears, the National Weather Service sounds the alarm. In Oklahoma on Monday, the alert came sixteen minutes before the tornado actually touched the ground, which is three minutes more than the thirteen-minute average warning the NWS provides. It triggered emergency broadcast alerts throughout the region and blaring air-raid sirens that allowed hundreds of thousands of people to seek shelter.

As a tornado is forming, NWS workers are synthesizing a rapid amount of data from radar, satellites, on-the-ground meteorologists, and citizens calling in what they see. The alerts have to be accurate—and they have to be quick.

“The adrenaline is building up. You’re looking at storms that you know are just really bad,” Dan Sobien, president of the National Weather Service Employees Organization, told The Nation. “It takes a special kind of person because you have to juggle ten or fifteen balls all at the same time, and then make life-and-death decisions based on that.

“It’s an extremely stressful, extremely busy time,” he said. “[It’s like] when an accident is occurring and you have seconds to make a decision as to whether to turn right, or left, or slam on your brakes or whatever—but stretched out over a couple hours. That kind of feeling.”

Five minutes after the tornado touched down on Monday, but twenty minutes before it hit Moore, Oklahoma, the NWS issued a strongly worded “tornado emergency” advisory:

This no doubt saved hundreds of lives in Moore. According to ABC News, the Plaza Towers Elementary School does not have an underground shelter—but the fourth, fifth and sixth grades had enough time to evacuate to a local church, where they remained safe. The entire school building was destroyed.

The NWS deserves enormous credit here. But what if it wasn’t up to the task? That’s an increasingly real possibility. Just this month, Sobien’s group, which represents 4,000 employees of the National Oceanic and Atmospheric Administration (of which NWS is a part), issued a warning that the budget battles are imperiling crucial NWS functions, and creating “[r]educed efficiency and accuracy for tornado events due to reduced alertness of short staffed offices.” Hurricane monitoring and response is also endangered, along with crucial wildfire monitoring efforts and a wide array of other NWS activities.

Since taking control of the House in 2011, Republicans have targeted NOAA for severe cuts—they came out of the gate proposing a massive 28 percent cut in their first budget that year, which was moderated by the end of the process.

But the assaults on the NOAA budget continued, and the agency couldn’t escape the sequester, which will lop 8.2 percent from the NOAA budget. This lead the acting administrator to institute an across-the-board hiring freeze in March, and four days of mandatory furloughs are on the horizon. (There is already a 10 percent vacancy rate at the agency.)

This is all occurring at an agency that could badly use more money, not less. The satellite equipment there is badly antiquated, and the Government Accountability Office said the “satellite gap” is one of the thirty biggest threats facing the federal government.

“Remember that bridge that collapsed in Minneapolis? The Weather Service is like that bridge a week before it collapsed,” Sobien said. “The strains are happening. I’m just seeing things just not working the way they should be.”

In fact, amidst all the turmoil yesterday, the NWS suffered some notable problems. In the evening a communications outage affected offices in Chicago; Anchorage; Binghamton, New York; and Kentucky, according to Sobien. The Nation confirmed this outage with an official at the NWS office in Chicago.

In addition, Sobien says the NWS office in Midland, Texas—the next office upstream from Oklahoma City that does upper-air surveillance of storms with weather balloons—declined to do a special weather balloon release after the storm to help monitor conditions because of budget concerns. (An official at that office said he was not aware of that particular situation.)

Those ended up being trivial outages, but next time might be different. If a disaster strikes where a NWS office is under-staffed, it’s easy to see how lives could be lost.

“The National Weather Service is an inherent government service, like the Post Office, like the FBI, you can name a dozen others. We had this debate about the National Weather Service a hundred-plus years ago, and said, yeah, this is a service we want for everyone,” Sobien said. “To be dismantling that doesn’t make a whole lot of sense to me.”